DE102017110954B4 - Drive plate device with clearance angle in the freewheel device, auxiliary drive and drive train - Google Patents

Abstract

The invention relates to a power take - off device (1) for an accessory of a motor vehicle drive train, comprising at least three rotary parts (2, 3, 4), a spring damper (5) rotationally coupling a first rotary part (2) to a second rotary part (3) and one between them second rotating part (3) and a third rotary part (4) acting freewheel device (6), wherein the freewheel device (6) has a plurality of locking elements (7) and these locking elements (7) are designed and arranged such that the second rotary member (3) in a switching position of the freewheel device (6) is rotationally coupled to the third rotary part (4) in a first rotational direction and in a second rotational direction opposite the first rotational direction via the blocking elements (7), the blocking elements (7) being inserted in such a way in that the second rotary part (3) is rotatable in the switching position in a clearance angle region (8) relative to the third rotary part (4). In addition, the invention relates to an accessory drive with the drive disk device (1) and a drive train with this auxiliary drive.

Description

The invention relates to a drive disk device for an accessory of a motor vehicle drive train, comprising at least three rotary members, a first rotary member rotatably coupled to a second rotary member spring damper and a between the second rotary member and a third rotary member / used freewheel device, wherein the freewheel device comprises a plurality of locking elements and these Blocking elements are designed and arranged such that the second rotary member in a (first) switching position of the freewheeling device in a first rotational direction and in a, opposite to the first rotational direction, second rotational direction via the locking elements rotationally / rotatably coupled to the third rotary member / operatively connected / connected is (ie supported on the third rotary part or is supportable). Furthermore, the invention relates to an auxiliary drive for a motor vehicle drive train and the drive train of the motor vehicle itself with the auxiliary drive.

A freewheel device is thus understood to mean, in particular, that device which is designed in such a way that, in the preferred (first) shift position, it completely grips the second and third rotational parts, i. rotatably in the first direction of rotation and an opposite second direction of rotation of the second rotary member by positive connection connects. The freewheel device is therefore used in this (first) switching position as a clutch. In other switching positions, the freewheel device then serves as a typical freewheel, wherein in another (second) switching position, the second rotary member in turn rotatably coupled / connected in its first direction of rotation with the third rotary member, however, in its second direction of rotation a free rotation (to a full 360 ° rotation) relative to the third rotary part is possible. According to a third switching position, it is also possible for the second rotary member with the third rotary member in the second rotational direction of the second rotary member rotatably coupled to each other / connect and instead in the first rotational direction of the second rotary member a free rotation (by a full 360 ° rotation) allow these two rotary parts relative to each other. Also, a fourth switch position is possible, in which a free rotation is possible in the first and second directions of rotation.

Various generic drive disk devices are already known from the prior art. The DE 10 2013 207 846 A1 discloses, for example, a pulley with a freewheel device.

Further prior art is known from DE 10 2009 039 989 A1 , of the DE 10 2010 023 714 A1 , of the DE 10 2013 209 640 A1 as well as the DE 10 2015 204 687 A1 known.

In existing Triebscheibenvorrichtungen a so-called clearance angle is provided in particular in the existing spring damper, as for example. With the DE 10 2010 023 714 A1 implemented. The disadvantage of this design, however, is that the spring capacity is reduced by the clearance angle.

It is therefore an object of the present invention to overcome the known from the prior art disadvantages and to provide a drive plate device with a freewheel device available, which is further improved in terms of the spring capacity of the spring damper.

This is inventively achieved in that the locking elements are used such that the second rotary member in the (first) switching position in a clearance angle range is rotatable relative to the third rotary member.

Thus, the clearance angle is shifted into the freewheel device. The spring damper may instead be designed and arranged so that the clearance angle is completely avoided / canceled in the spring damper. This significantly increases the spring capacity.

In this case, the spring damper has a circumferentially play-free spring used, which supports the first rotary member relative to the second rotary member spring-damped. Even more of these springs, preferably two such springs are preferably used in such a way.

The spring is inserted / received in the circumferential direction between a first support region formed by the first rotary part and a second support region formed by the second rotary part, whereby the clearance angle previously present in the spring damper is completely eliminated. Thus, the spring damper is designed free angle. The first rotary member and the second rotary member each have four support portions for the four end turns of the spring / bow spring.

In this context, it is expedient if the spring in the circumferential direction is supported directly (with one end) to the support areas / rests.

In a typical way, the spring damper is designed as a bow spring damper and thus the spring is formed as a bow spring.

Are the locking elements designed as pawls, the freewheel device is with a particularly robust and space-saving latch mechanism provided.

In this context, it is particularly advantageous if the freewheel device is implemented as a switchable freewheel device and thus the drive disk device is implemented as a switchable drive disk device, which is also referred to as drive disk decoupler.

In addition, it is particularly preferred if the drive disk device is designed as a pulley device / a pulley decoupler.

It is also advantageous if each locking element is pivotally mounted on one of the two second and third rotary parts (about a rotation axis) / is received and cooperates with a recess in the other of the two second and third rotary parts. As a result, the structure of the freewheel device is further simplified.

Furthermore, it is advantageous if a first blocking element is arranged such that, in a first free-angle end position, it rotationally supports the second rotating part in its first direction of rotation relative to the third rotating part.

In this regard, it is also expedient if a second blocking element is arranged so that it rotatably supports the second rotary part in a second free-angle end position in the second rotational direction relative to the third rotary part. Thus, for the support of the two rotating parts in the respective direction of rotation of the second rotary member own locking element is present and the freewheel device between as many switching positions easily switchable.

In particular, it is advantageous if each blocking element is assigned its own depression, into which the blocking element is pivoted in the (first) switching position and is received in a form-fitting manner.

Furthermore, the invention relates to an accessory drive for a vehicle drive train, with a endless traction means and the drive plate device according to the invention according to at least one of the embodiments described above, wherein the endless traction means is coupled to the first rotary member or the third rotary member motion coupled / drive.

Furthermore, it is advantageous to provide a drive train of a motor vehicle with turn this accessory drive.

In other words, according to the invention, a pulley decoupler (drive disk device, preferably designed as a switchable pulley decoupler) with a clearance angle in the latch system is preferably provided. In the pulley decoupler (preferably with the switchable freewheel (freewheel device)) the Bogenfederkapazität should be maximized in the available spring channel. A clearance angle between Bogenfederflansch (second rotary member), bow spring and Bogenfederanschlag (first rotary part) reduces the capacity so far. In the case of the belt pulley coupler according to the invention with freewheel it is therefore proposed to provide the clearance angle in the freewheel, in particular in a pawl freewheel.

The invention will now be explained in more detail with reference to a figure.

It shows the only one 1 a cross-sectional view of a drive disk device according to the invention according to a preferred embodiment, wherein the drive disk device is shown cut in such a way that both the structure of a spring damper and a freewheel device of the drive disk device is clearly visible.

The figure is merely schematic in nature and is for the sole purpose of understanding the invention. The same elements are provided with the same reference numerals.

The drive disk device according to the invention 1 is in the 1 particularly well recognizable in terms of their basic structure. The drive disk device 1 is formed in this embodiment as a pulley decoupler, namely as a switchable pulley decoupler. In a preferred area of use, the drive disk device serves 1 as a switchable coupling element between an auxiliary unit and an endless traction means coupled to an output shaft of an internal combustion engine. The drive disk device 1 is thus preferably designed for an accessory of a motor vehicle drive train. In principle, the drive disk device 1 However, it can also be used in other fields of application in which an endless traction device, such as here a belt, or alternatively a chain, is used to drive a secondary shaft.

The drive disk device 1 has a first rotary part 2 on. This first turned part 2 is essentially designed as a drive wheel (ie, input or output gear depending on the operating state of the motor vehicle). The first turned part 2 is by means of a spring damper 5 rotational with a second rotating part 3 coupled. The second turning part 3 is annular and radially inwardly (with respect to a rotational axis of the drive disk device 1 ) an annular peripheral Zugmittelaufnahmekontur 13 of the first rotary part 2 arranged or connected to the crankshaft. The second turning part 3 is by means of the spring damper described in more detail below 5 relative to the first rotary part 2 coupled spring-damped.

Between the second rotary part 3 and another third rotary part 4 is a freewheel device 6 arranged / inserted. The third rotary part 4 has a hub area 14 on, which is radially within an annular body 15 of the second rotary part 3 is arranged. The freewheel device 6 is thus radially between the second rotary part 3 and the third rotary part 4 arranged.

The freewheel device 6 has a switchable locking mechanism, here in the form of a latch mechanism on. The freewheel device 6 is thus as a switchable freewheel device 6 implemented and adjustable between different switching positions. The freewheel device 6 has a plurality of circumferentially distributed locking elements 7 ; 7a . 7b on. The blocking elements 7 ; 7a . 7b are each designed as a latch.

The blocking elements 7 ; 7a . 7b In particular, they can be divided into two groups. Several first blocking elements 7a a group of first blocking elements 7a serve in a 1 shown first switching position of the freewheel device 6 as positively acting connecting elements / support elements for non-rotatable connection / support of the second rotating part 3 with / on the third rotary part 4 in a first direction of rotation of the second rotary part 3 or connecting / supporting the third rotary part 4 to the second rotary part 3 in the second direction of rotation opposite the first direction of rotation (corresponding to whether the introduction of force by the second or third rotary part 3 or 4 he follows). The first direction of rotation of the second rotating part 3 is with the reference arrow 16 illustrated. Several second blocking elements 7b a group of second blocking elements 7b serve in the first switching position of the freewheel device 6 as positively acting connecting elements / support elements for non-rotatable connection / support of the second rotating part 3 with / on the third rotary part 4 in one, the first direction of rotation 16 opposite, second direction of rotation of the second rotating part 3 or connecting / supporting the third rotary part 4 to the second rotary part 3 in the first direction of rotation. The second direction of rotation of the second rotating part 3 is with the reference arrow 17 illustrated.

In the in 1 shown first switching position is the freewheel device 6 thus with their locking elements 7 ; 7a . 7b adjusted so that it forms a positive-acting coupling and thus the two second and third rotary parts 3 and 4 in the two first and second directions of rotation of the second rotary part 3 combines. In this context, it should be noted that the freewheel device 6 in turn, is used as a typical freewheel in another two switching positions / serves. Thus, in other switching positions, only the first locking elements 7a (in a second switching position) or only the second locking elements 7b (In a third switching position) in positive engagement with the two second and third rotary parts 3 and 4 whereas the other locking elements 7a or 7b except positive engagement with the two second and third rotary parts 3 and 4 are arranged. In a further fourth switching position, it is also possible, neither the first locking elements 7a still the second locking elements 7b with the corresponding wells 12a . 12b bring in positive engagement and thus a complete rotational decoupling of the second rotary member 3 in the first rotational direction and in the second rotational direction relative to the third rotary part 4 to achieve.

In this embodiment, three first locking elements each 7a and three second blocking elements 7b available. However, the number can be changed arbitrarily and accordingly also to a number less than three or greater than three vote. The first blocking elements 7a alternate in this embodiment in the circumferential direction with the second locking elements 7b from. Thus, seen in the circumferential direction between two consecutive locking elements 7a a second blocking element 7b , or vice versa, arranged.

Each blocking element 7a . 7b is a special depression 12 ; 12a . 12b assigned. The respective depression 12 is configured as a radially extending bulge. In particular, the depressions 12a and 12b each designed the same. A first recess 12a is in each case a first blocking element 7a and a second recess 12b one of the second blocking elements 7b assigned. Every well 12 ; 12a . 12b has a first side edge arranged toward a first circumferential direction 18 as well as one of these first side flanks 18 opposite and thus to one of the first circumferential direction opposite second circumferential direction arranged second side edge 19 on. The number of wells 12a and 12b / Notches is not dependent on the number of locking elements 7a . 7b , Thus, the number of wells 12a and 12b / Notches larger, preferably a multiple, or smaller than the number of locking elements 7a . 7b be.

The first side flank 18 the second well 12b used for turning the second rotary part 3 in the second direction of rotation (in the first Switch position after 1 ) for positively supporting one in the recess 12b pivoted in the first end of the second locking element 7b , A first end of this second end opposite the second locking element 7b is about an axis of rotation not shown here for clarity, which extends axially, on the third rotary part 4 pivoted.

Accordingly serves a second side edge 19 the first well 12a upon rotation of the second rotary part 3 in the first direction of rotation (in the first switching position to 1 ) for positively supporting a first end of the first blocking element 7a , A first end opposite the second end of the first blocking element 7a is about an axis of rotation not shown here for clarity, which extends axially, on the third rotary part 4 pivoted.

As can also be seen here, the first locking elements 7a in the circumferential direction opposite to the second locking elements 7b used. Accordingly, the first blocking element extends 7a from the bearing point on the third rotary part 4 in the second circumferential direction, while the second locking element 7b essentially from the bearing point on the third rotary part 4 extends away in the first circumferential direction. The blocking elements 7 ; 7a . 7b However, in principle, can also be reversed at the second and second third rotary parts 3 . 4 be included.

The blocking elements 7 ; 7a . 7b are used such that the second rotary part 3 in the first switching position shown in a certain clearance angle range 8th relative to the third rotary part 4 is rotatable. This clearance angle range 8th is through the formation of the wells 12a and 12b or their positioning relative to the Sperrele instruments 7a respectively. 7b specified. In the in 1 shown position / position is neither the first blocking element 7a still the second blocking element 7b in circumferential arrangement with the first side flank 18 or the second side edge 19 , In this position, the locking elements 7a and 7b in a middle of the clearance angle range 8th arranged. The clearance angle range 8th on the one hand, through the first side flank 18 the second well 12b and on the other hand by the position of the second side edge 19 the first well 12a determined in the first switching position. Between these two side flanks 18 . 19 the circumferentially successive depressions 12a . 12b is the third turning part 4 relative to the second rotary part 3 freely rotatable, without positive contact with the respective side flank 18 . 19 to get. A first free-angle end position is thus achieved in that the second rotary part 3 in the first direction of rotation relative to the third rotary part 4 over the respective first blocking element 7a is rotatably supported. A second free-end angle position, on an opposite circumferential side of the clearance angle range 8th is provided is achieved in that the second rotary part 3 in the second rotational direction relative to the third rotary part 4 over the respective second blocking element 7b is rotatably supported.

Furthermore, with respect to the spring damper 5 , which is designed here as a bow spring damper, recognizable that in the spring damper 5 provided springs 9 in the circumferential direction backlash between support areas 10 . 11 at the first and second rotary part, respectively 2 . 3 supported / inserted. In this embodiment, two springs 9 provided, which are designed as bow springs. Every spring 9 is on the part of a merely indicated first support area 10 on the first rotary part 2 supported free of play. The first support area 10 is shown only schematically. The respective spring 9 is supported in particular free of play with a first circumferential end on the first support portion 10. With a second end of the respective spring opposite the first end in the circumferential direction 9 is the spring 9 at a second support area 11 which is directly on the second rotary part 3 is formed, supported. As in 1 good to see is every spring 9 in the circumferential direction backlash between the two support areas 10 and 11 supported. Thus, the respective spring 9 used with a certain bias between the support areas 10 and 11. The feathers 9 are therefore used free-angle. The spring damper 5 thus has no clearance angle. Depending on whether the moment in the first turned part 2 or the second rotary part 3 is introduced, the bow spring ends are supported correspondingly opposite to the support areas 10 . 11 in turned part 3 respectively. 4 from.

In other words, according to the invention, a clearance angle between the flange (second rotary part 3 ), Bow spring 9 and stop (first turned part 2 ) are omitted in its usual position; instead, this clearance angle in the latch system (freewheel device 6 ) housed.

An outer input or output element (first rotary part 2 ) contains the bow spring stops (first support areas 10 ) includes. Here is the bow feather 9 Contact to the bow spring flange (second rotary part 3 ) and the attacks 10 , Thus, there is no clearance angle here. A clearance angle (clearance angle range 8th ) is in the latch system 6 intended. The clearance angle 8th is to be adjusted depending on the engine application and may possibly be much larger than shown. The flange 3 at the same time assumes the function of the outer ring for the freewheel 6 , Between latch 7 ; 7a . 7b and outer ring 3 or inner ring 4 is the clearance angle 8th , The clearance angle 8th is basically intended to switch (swing) the pawl 7 ; 7a . 7b to enable. The handle 7 ; 7a . 7b rests on the opposite side on the inner ring 4 or outer ring 3 for initiating or discharging forces. The clearance angle range 8th (Distance between outer ring 3 and latch 7 ; 7a . 7b in the circumferential direction) is chosen so large that a motor-specific necessary clearance angle is included. The clearance angle 8th Optionally also available between inner ring 4 and latch 7 ; 7a . 7b be positioned, in which case the latch 7 ; 7a . 7b on the outer ring 3 supported. The number of notches (depressions 12 ; 12a . 12b) can be optimized by tuning the pawl positions.

LIST OF REFERENCE NUMBERS

1

Drive pulley device

2

first turned part

3

second rotary part

4

third rotary part

5

spring shock absorber

6

Freewheel device

7

blocking element

7a

first blocking element

7b

second blocking element

8th

Free angle range

9

feather

10

first support area

11

second support area

12

deepening

12a

first recess

12b

second recess

13

Zugmittelaufnahmekontur

14

hub area

15

body

16

first reference arrow

17

second reference arrow

18

first side flank

19

second side flank

Claims (8)

Drive disk device (1) for an accessory of a motor vehicle drive train, comprising at least three rotary parts (2, 3, 4), a spring damper (5) rotationally coupling a first rotary part (2) to a second rotary part (3), and a spring damper (3) between the second rotary part (3 ) and a third rotary part (4) acting freewheel device (6), wherein the freewheel device (6) has a plurality of locking elements (7) and these locking elements (7) are designed and arranged such that the second rotary member (3) in a switching position of the freewheel device (6) in a first rotational direction and in a, opposite to the first rotational direction, the second rotational direction via the locking elements (7) rotatably coupled to the third rotary member (4), wherein the locking elements (7) are inserted such that the second rotary member (3) in the switching position in a clearance angle range (8) relative to the third rotary part (4) is rotatable, wherein the spring damper (5) in the circumferential direction playf has inserted spring (9) which supports the first rotary member (2) relative to the second rotary member (3) spring-damped, characterized in that the spring (9) in the circumferential direction between a, by the first rotary member (2) formed, first Supporting region (10) and one, by the second rotary member (3) formed, second support region (11) is inserted biased. Drive plate device (1) after Claim 1 , characterized in that the spring (9) in the circumferential direction directly on the support areas (10, 11) is supported. Drive disk device (1) according to one of Claims 1 to 2 , characterized in that the blocking elements (7) are designed as pawls. Drive disk device (1) according to one of Claims 1 to 3 , characterized in that the locking elements (7) are each pivotally mounted on one of the two second and third rotary parts (3, 4) and with a recess (12) in the other of the two second and third rotary parts (3, 4) cooperate. Drive disk device (1) according to one of Claims 1 to 4 , characterized in that a first blocking element (7a) is arranged so that it rotatably supports the second rotary part (3) in the first rotational direction relative to the third rotary part (4) in a first free-angle end position. Drive disk device (1) according to one of Claims 1 to 5 , characterized in that a second blocking element (7b) is arranged so that it rotatably supports the second rotary part (3) in the second rotational direction relative to the third rotary part (4) in a second free angle end position. An accessory drive for a motor vehicle drive train, comprising an endless traction device and a drive disk device (1) according to one of the Claims 1 to 6 wherein the endless traction means is rotationally coupled to the first rotary member (2) or the third rotary member (4). Drive train of a motor vehicle, with an auxiliary drive after Claim 7 ,

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